Electro-acoustic transducer element

Details Electro-acoustic transducer element Electro-acoustic transducer element

1980-04-23

1983-05-10

Miller, J. D.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310321, 310327, 310800, H01L 4104

Patent

active

043831940

ABSTRACT:
Electro-acoustic transducer element having its resonant frequency in a lower frequency range advantageously usable for diagnostic purposes comprises a polymeric piezoelectric film such as polyvinylidene fluoride film being coupled with an additional layer having a thickness specified in relation to the wavelength of sound waves within the additional layer at the free resonant frequency of the polymeric piezoelectric film, the additional layer having an acoustic impedance related to the acoustic impedance of the polymeric piezoelectric film.

REFERENCES:
patent: 3277435 (1966-10-01), Thompson et al.
patent: 3798473 (1974-03-01), Murayama et al.
patent: 3943614 (1976-03-01), Yoshikawa et al.
patent: 3969927 (1976-07-01), Yoshida et al.
patent: 4166967 (1979-09-01), Benes et al.

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